Heat removal from heat-transforming apparatus



July 1, 1930'.

R. W. DAVENPORT HEAT REMOVAL FROM HEAT TRANSFORMING APPARATUS Filed March 13 L/ LIIIIHTIIH] X f\\\\\\\\\ k TTTTTT; 4 HUM INVENTOR.

Par/750m W Davenporf BY ATTORNEY.

Patented July 1, 1930 UNITED STATES PATENT OFFICE RANSOM W. DAVENPORT, OI DETROIT, MICHIGAN, ASSIGNOR TO CHICAGO PNEUMATIC TOOL COMPANY, OF NEW YORK, N. Y., A. CORPORATION OF NEW JERSEY HEAT REMOVAL FROM HEAT-TRANSFOBMING APPARATUS Application filed March 13, 1926. Serial No. 94,402.

This invention relates to heat transforming systems utilizing mechanical means and more particularly to certain arrangements of the apparatus having a direct bearing upon the cooling of the same and the ejection of heat from such systems.

In designing refrigerating apparatus for household use it is desirable from the standpoint of economical operation to depend upon air, rather than Water, as the medium for removing heat. .Usually the air is forced to traverse the surface of the condenser, ordinarily in the form of a coil of pipe, by means of a fan which is mounted on a separate standard and arranged to be driven by the belt which serves as the driving connection between the motor and the compressor. As a rule the velocity of the air stream is not great and it strikes directly 120 only a portion of the condenser coil due to the mass of the latter and its frequently noncompact arrangement. Sometimes the compressor or the motor is arranged to be at least partly cooled by the air stream.

Among the objects of my invention are to provide an improved arrangement of the refrigerating elements, to permit the cooling of motor, condenser and compressor by the same air stream, to provide a compact yet 1:0 accessible arrangement of said elements, and

in general to simplify and to improve prior forms and arrangements.

lVhile my invention is susceptible of varied forms to secure in greater or less degree the above results, the preferred arrangement is to so dispose the elements that a forced circulation of air removes heat from motor, condenser, and compressor. The fan is mounted directly upon the armature shaft of the motor rather than upon a separate standard and driven by the power belt as in conventional systems. Thus the fan is driven at the speed of the armature and ample volume and velocity of the air current is insured. The air stream is directed over and about the elements other than the motor by suitable deflecting means which may be inserted in or form a part of the compartment in which the elements are disposed. The efliciency of the cooling is increased by a careful spacing and grouping of the elements with due consideration to the form and arrangement of the deflecting means.

In order to illustrate the invention, concrete embodiments thereof are shown in the accompanying drawings in which:

Fig. 1 is a vertical sectional view through the apparatus compartment showing the elements in elevation and indicating the refrigerating chamber and connections therein diagrammatically.

Fig. 2 is a horizontal sectional View on the line 22 of Fig. 1.

Fig. 3 is a fragmentary view similar to Fig. 2 showing a different arrangement for one side of the apparatus compartment.

A complete refrigerating system is indicated in Fig. 1, wherein the refrigerating chamber A and its refrigerating coil 'or heat absorbing unit a are indicated diagrammatically. The top of unit a is connected by a pipe a to a pump or compressor 4 from which extends a pipe (1 discharging into a condenser 5, from which in turn extends a pipe or which connects through a suitable expansion device or valve a with the base of the unit a. The refrigerating apparatus, aside from unit a and valve a, and comprising the compressor 4, condenser 5 and prime mover or electric motor 6 may be disposed in any suitable or desired place, as in a compartment B which is shown in the drawing as positioned directly beneath the refrigerating chamber A. Motor (5 is arranged to drive compressor 4 through any suitable driving connection such as a belt 7. Air agitating means in the form of a fan 8 is disposed upon the arn'iature shaft of motor 6 to induce a flow of air over and across the elements of the refrigerating system from which it is desirable to remove heat.

Elements 4, 5, and 6 of the refrigerating apparatus are compactly and accessibly grouped or arranged, the preferred arrangement being shown in Fig. 2, wherein motor 6 and compressor 4, are disposed with their rotatable shafts in substantial parallelism to permit the use of a flexible driving connection such as the belt 7. Disposed intermediate the motor and compressor but rearwardly of the same is the condenser '5 which may be of any suitable or desired type. The particular form of condenser shown is the tank type, disclosed per se in my copending.

application Serial No. 7 8,563, filed December 31st, 1925 and as to a refrigerating process utilizing such a condenser, in my copending applieationSerial No. 77,156, filed December 22nd, 1925. It will be clear from the arrangement disclosed in Figs. 1 and 2 that elements 4 and 5 of the refrigerating system are quite out of line with the armature shaft of the motor 6. In order that the stream of air produced by fan 8 may be effective for cooling or removing heat from theelements of the system suitable deflecting means are provided so disposed as to direct the air stream over and around condenser 5 and at least partly upon compressor 4. One arrangement is shown in .Figs. 1 and 2 wherein a curved deflector 9 is ositioned rearwardly of the apparatus. I desired the deflector may form a part of the walls of the compartment 13. As indicated in Fig. 2, the cooling stream of air induced by fan 8 enters and leaves compartment B through openings in one wall thereof, the stream being forced by the deflector 9 to take a semi-circle path as indicated by the arrows. Fan 8 is shown drawing air into compartment B forcing it across motor 6 and directly upon and over condenser 5 and thence upon and over compressor 4. While this is the preferred arrangement the fan may have its blades oppositely inclined to act as an aspirator, in which case the direction of the air stream would be opposite to that shown.

In Fig. 3 is shown a slightly modified arrangement in which the air is made to issue (or enter de endent upon the inclination of the fan bla es) at the end of the compartment rather than at the side as shown in Fig. 2. In this case the curved deflector .9- need extend only to a point approximately rearwardly of condenser 5. With this arrangement the full stream of cooling air is not directed over compressor 4, an arrangement which may be preferable with certain heat transforming systems to prevent a premature cooling of the working substance. In fact compressor 4 can be entirely shielded from the cooling stream if necessary or desirable.

From the above it will be apparent that the use of deflector means after the manner disclosed in this application permits a very compact grouping of the elements of a refrigeratin system with an increase in the coolin mounting of the fan directly upon the high speed shaft of the motor rather than upon a separate standard driven by .the belt in I sures a high velocity air stream limited in e ect rather than a loss, that the volume only by the size of the fan, that the structural arrangement is especially adaptable to the use of tank condensers which re uire an effective coolin arrangement, an thatby a proper use ofdeflectin means any desired coolin effect, or lack o it, 1s easi y secured in re ation to the compressor.

While preferred arrangements in accordance with the invention are herein shown and described, it is to be understood that the invention is not limited to the specific details thereof but covers all changes, modifications and ada tations within the scope of the appended c aims.

I claim as my invention i 1. In a refrigerating system, in combination, a compartment, a motor and a compressor in said compartment, a driving connection from said motor to said compressor, a tank condenser in said compartment disposed intermediate said motor and said compressor but rearwardly of the same, a

fan on said motor arranged to move a stream of air over the motor, and deflecting means in said compartment extending in a curve rearwardly of all said elements for directing said stream over and aroun said condenser and at least partly over and around said compressor, said deflector being arranged so that the stream of air enters and leaves said compartment at the same side thereof.

2. In a refrigerating system, in combination; a compartment, refrigerating a paratus in said compartment comprising t e following elements-a motor, a condenser, and

'a compressor, said elements being asymmetrlcally grouped, a driving connection from said motor to said compressor, a fan on said motor, and a deflector substantially semi-circular in form in said compartment disposed rearwardly of and enclosing said elements for directing the air stream produced by said fan over and around all said 1 elements.

. 3. In heat' transforming apparatus, in combination, an electric motor, a fan on'the shaft of said motor, a condenser out of line with said shaft, and a deflector at least partly arcuate in'eross section disposed rearwardly .of said motor to direct the air stream from said fan upon and around said condenser, the center of the curve of the arcuate portion of said deflector being apart from and out'of line with the axis of said shaft.

Signed by me at Detroit, Wayne County, Michigan this 8th da of March 1926.

RANSOM DAVENPORT. 

